Fauci keeps moving the goalposts and changes his recommendations on an almost weekly basis.
Lots of very intelligent men have risen to positions of great power, but they are evil to the core and the resultant carnage they left behind is legendary.
Credentials mean nothing when dealing with someone so dishonest
New research results about Covid-19 are released on a daily basis. If Fauci did not review the latest research and update his recommendations accordingly, then I would question his credentials. However, since he appears to stay informed and make recommendations based on the newest information, I have no reason to doubt his qualifications.